Sectional abrasive reamer



July 31, 192s. 1,679,269

R. S. RODGERS SECTIONAL ABRASVE BEAMER Filed Jan. 27; 1926 WI-TNESS=W1%W Patented July 31,1928.

IUNITED]` STATES PATENT? former..

` RALPH s. RonGEns'oP PITTSBURGH, PENNSYLVANIA, AssiGNoR or ONE-Fountain To JAMES HARMONfAND ONE-FOURTH TO IKE J'. NELSON, v:BOTH OF PITTSBURGH,

PENNSYLVANIA.

lsne'rrormi. ABRAsIvE BEAMER..

My present invention has reference to an` efficient means for roaming the bores of cylinders, bushings or the walls of other round openings. D

An important object of my invention is the provision of an abrasive reamer for this purpose whose reaming head is made up ofor machine driven and which includes a cone carrying shank, the cone portion of which is engaged bythe beveled inner faces of' the segmental head of the reamer, the sections of the said head being spring influenced .toward the cone, and being likewise spring 1nfluenced on the shank. Simple means is provided for adjusting the last mentioned spring means for moving the cone and shank longitudinally with respect to the head for expanding or contracting the head segments, thereby accurately adjusting the headwith respect to the work on which it is to operate.

To the attainment of the aforegoing objects and others which will present themselves as the nature of the invention is better understood, the improvement further resides in certain novel features of construetion, combination and operative association of parts, a satisfactory embodiment of which is illustrated by the accompanying drawings.

In the drawings,

Figure 1 is a side elevation of my 1mprovement.

Figure 2 is a face view thereof.

Figure 3 is a section view on the line 3-3 of Figure 2.

In carrying out my invention, I make use of a shank 1, having on one end and enlarged frusto-conical enlargement 2. The opposite end of the shank 1 is reduced and squared in cross section, as at 3, to provide a wrench hold, or to permit of the shank being arranged in the chuck of a suitable machine.

The shank 1, inward of its end 3, is threaded for a suitable distance, as at 4:, and screwed on these threads there is a nut 5 which engages a washer 6 that iscontacted by one end of a helical spring 7 that sur segment has its inner face or bore ared as at 12 Afor contacting engagement with the con-e 2 of the shankvl. The opposite faces of the segments 10, adjacent to the outer periphery thereof are providedwith oppositely disposed annular depressions 13 that communicate with round sockets 14' formed on the inner walls of the said depressions 13.

coils 15, and these springs hold the segments 10 against the cone 2. f Y

Each segment 10 has its inner wall 12, preferably at the center thereof formed with a continuous notch 1G, and the cone 2 has projectingpins 17 that enter the respective notches 16. By this arrangement, the head segments are locked on the cone 2, so that both the cone and head will turn inwardly, while the pinsv holdthe segments in proper relative position when the-nut 5 is adjusted on the stem 1 and the segments comprising the head 9 are either expanded orcontracted.

The simplicity of my construction and the advantages thereof will, it is thought, be perfectly apparent to those skilled in the art to which this invention relates, Vwhen the foregoing description has been carefully read in connection with the accompanyingudrawings, but I desire it understood that I have herein set forth only one satisfactory embodiment of my improved device and that I am not to be restricted thereto but may In the sockets 111, there are endless spring Y make all such changes therefrom as fairly fall within the scope of my claim.

I-Iaving thus described the invention, what is claimed as new, is y A reamer, comprising a cone carrying shank, a reamer head comprising a circular member having an abrasive face and made up` of segments, the inner faces of said segments being complemental to and vresting afainst the colle. vsaid se ments havino con.

e n n.

the segments, a nut screwed on the shank, a helical spring on the shank7 contacting with the collar and a washer engaged by the mit and contacted by the spring.

In testimony whereof I aflix my signature.

RALPH S. RODGERS. 

